An expression is shown below: 22(x¹-x³-20x²) Varun performed the first step to factorise the expression as shown below. 22x²(x²-x-20) Using which identity can Varun factorise the expression further?
a) (a + b)² = a² + 2ab + b²
b) (a - b)²=a² - 2ab + b²
c) (a + b)(a - b) = a² - b²
d) (x + a)(x + b) = x² + (a + b)x + ab
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