Question

Find the area of rectangle whose length is (3x + 7) cm and breadth (7x + 5)cm.​

Answer 1

Answer:

${42x}^{2} + 128x + 70$ cm^2

Step-by-step explanation:

Given,

length = (3x+7)cm

breadth = (7x+5)cm

We know that,

Area of rectangle = 2(length+breadth)

= 2{(3x+7)+(7x+5)}

= 2(21x^2+64x+35)

= 42x^2+128x+70

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