The length of the rectangle is 84cm. How many square centimeters will the area of this rectangle
September 20, 2021 | education
| 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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