Question

using the standard formulae,expand each of the following (7x+5y)2​

Answer 1

$(7x + 5y) {}^{2}$

${(7x)}^{2} + {(5y)}^{2} + 2(7x)(5y)$

$49 {x}^{2} + 25 {x}^{2} + 70xy$