Question

(14) Expand : (5x - 2 )².

Answer 1

we know that (A-B)^2 = A^2 - 2(A)(B) + B^2

${(5x - 2)}^{2} = {(5x)}^{2} + {2}^{2} - 2(5x)(2) \\ = = > 25 {x}^{2} + 4 - 20x \\ \\ = = > 25 {x }^{2} - 20x + 4$

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