Question

Answer these 2 questions please please

Answer 1

(d) 9x²+16y²-24xy

(a) 4ab

Step-by-step explanation:

${(3x - 4y)}^{2}\\ = {(3x)}^{2} {(4y)}^{2} - 2(3x)(4y) + \\ = 9 {x}^{2}+ 16 {y}^{2} - 24xy$

${(a + b)}^{2} - {(a - b)}^{2} \\ = (a + b + a - b)(a + b - a + b) \\ = (2a)(2b) \\ = 4ab$