if a piece of cardboard 30 inch by 15 inch is made into an open donut box by cutting out squares
of side x from each corner. Then, which expression is equivalent to above statement ? [ ]
4x? - 90x² + 450 x 2) 4x + 90x2 - 450x 3) 4x2 + 90x² + 450 4) none of these
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4x² - 90x² + 450 is expression for base area of donut box
Step-by-step explanation:
a piece of cardboard 30 inch by 15 inch is made into an open donut box by cutting out squares of side x from each corner.
Then Length & breadth of box
= 30 - 2x & 15 - 2x
Area of Base = (30 - 2x)(15 - 2x)
= 450 - 60x - 30x + 4x²
= 450 - 90x + 4x²
= 4x² - 90x² + 450
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