Algebra Formulas

Algebra may be a branch of arithmetic that substitutes letters for numbers. AN algebraical equation depicts a scale, what’s done on one aspect of the dimensions with variety is additionally done to either aspect of the dimensions. The numbers ar constants. pure mathematics conjointly includes real numbers, complicated numbers, matrices, vectors and far additional. X, Y, A, B ar the foremost ordinarily used letters that represent the algebraical issues and equation 1b.

Important Formulas in Algebra

Here is a list of Algebraic formulas –

  • a2 – b2 = (a – b)(a + b)
  • (a+b)2 = a2 + 2ab + b2
  • a2 + b2 = (a – b)2 + 2ab
  • (a – b)2 = a2 – 2ab + b2
  • (a + b + c)2 = a2 + b2 + c2 + 2ab + 2ac + 2bc
  • (a – b – c)2 = a2 + b2 + c2 – 2ab – 2ac + 2bc
  • (a + b)3 = a3 + 3a2b + 3ab2 + b3 ; (a + b)3 = a3 + b3 + 3ab(a + b)
  • (a – b)3 = a3 – 3a2b + 3ab2 – b3
  • a3 – b3 = (a – b)(a2 + ab + b2)
  • a3 + b3 = (a + b)(a2 – ab + b2)
  • (a + b)3 = a3 + 3a2b + 3ab2 + b3
  • (a – b)3 = a3 – 3a2b + 3ab2 – b3
  • (a + b)4 = a4 + 4a3b + 6a2b2 + 4ab3 + b4)
  • (a – b)4 = a4 – 4a3b + 6a2b2 – 4ab3 + b4)
  • a4 – b4 = (a – b)(a + b)(a2 + b2)
  • a5 – b5 = (a – b)(a4 + a3b + a2b2 + ab3 + b4)
  • If n is a natural number an – bn = (a – b)(an-1 + an-2b+…+ bn-2a + bn-1)
  • If n is even (n = 2k), an + bn = (a + b)(an-1 – an-2b +…+ bn-2a – bn-1)
  • If n is odd (n = 2k + 1), an + bn = (a + b)(an-1 – an-2b +…- bn-2a + bn-1)
  • (a + b + c + …)2 = a2 + b2 + c2 + … + 2(ab + ac + bc + ….)
  • Laws of Exponents (am)(an) = am+n (ab)m = amb(am)n = amn
  • Fractional Exponents a0 = 1 aman=amn am = 1am am = 1am
  • Roots of Quadratic Equation
    • For a quadratic equation ax2 + bx + c where a ≠ 0, the roots will be given by the equation as b±b24ac2a
    • Δ = b2 − 4ac is called the discrimination
    • For real and distinct roots, Δ > 0
    • For real and coincident roots, Δ = 0
    • For non-real roots, Δ < 0
    • If α and β are the two roots of the equation ax2 + bx + c then, α + β = (-b / a) and α × β = (c / a).
    • If the roots of a quadratic equation are α and β, the equation will be (x − α)(x − β) = 0
  • Factorials
    • n! = (1).(2).(3)…..(n − 1).n
    • n! = n(n − 1)! = n(n − 1)(n − 2)! = ….
    • 0! = 1
    • (a+b)n=an+nan1b+n(n1)2!an2b2+n(n1)(n2)3!an3b3+.+bn,where,n>1

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