The length of the rectangle is 84cm. How many square centimeters will the area of this rectangle

The length of the rectangle is 84cm. How many square centimeters will the area of this rectangle increase if its width is increased by 15?

Let’s denote b – the width of the rectangle, then the area will be equal to:
S = 84 * b = 84b cm²
Let’s find the area of the rectangle if its width is increased by 15 cm:
S = 84 * (b + 15) = (84b + 1260) cm²
Let’s find how much the area has increased:
84b + 1260 – 84b = 1260 cm²
Answer: with an increase in width by 15 cm, the area of the rectangle will increase by 1260 cm².



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