Question

expand using formulae (4x+5)^2​

Answer 1

Answer:

$( {4x + 5})^{2} \\ \\ =( {4x})^{2} + 2 \times 4x \times 5 + ( {5})^{2} \\ \\ = {16x}^{2} + 40x + 25 \\ \\ formula \: used \\ \\ (a + b) ^{2} = a ^{2} + 2ab + b ^{2}$

hope it helps uH ✔

Answer 2

Step-by-step explanation:

Using formula (x+y)²= x² +y² +2xy

here, x = 4x qnd y = 5

= (4x)² +(5)² +2(4x) (5)

16x² +25 +40x.