Question

solve the following using idetity ( 7x - 4y) ²​

Answer 1

Answer:

below

Step-by-step explanation:

(7x-4y)²

=(7x)²-(4y)²

=49x²-16y²

Answer 2

Answer:

${49x}^{2} + {16y}^{2} - 56xy$

Step-by-step explanation:

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

(7x-4y)^2 = (7x)^2 + (4y)^2 - 2× 7x × 4y

= 49x^2 + 16y^2 - 56xy