Question

the length and width of a rectangle are 7 cm and (x - 8) cm respectively. Find the value of x if the area of the rectangle is 42 cm2.​

Answer 1

Area of Rectangle = length × breadth

42cm² = 7(x-8)

42 = 7x-56

42+56 = 7x

98 =7x

$\frac{98}{7} = x \\ x = 14$

Answer 2

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