Question

3. Expand using formula (7-4)2​

Answer 1

according to the algebraic formula,

${(a - b)}^{2} = {a}^{2} + {b}^{2} - 2ab$

$(7 - 4) {}^{2} = {7}^{2} + {4}^{2} - 2(7)(4) \\ (7 - 4) {}^{2} = 49 + 16 - 56 = 9$

Hope my answer will help you