Question

Expand the following using suitable identity (5x+4y)^2

Answer 1

Answer:

(a+b)^2=a^2+b^2+2ab

a=5x, b=4y

(5x+4y)^2=(5x)^2+(4y)^2+2*5x*4y

=25x^2+16y^2+40xy

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Step-by-step explanation:

Answer 2

Answer:

25x² + 40xy + 16y²

Step-by-step explanation:

identity= (a+b)² = a² + 2ab + b²

                           = (5x)² + 2 × 5x × 4y + (4y)²       [ a = 5x /  b = 4y]

                           = 25x² + 40xy + 16y²