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Algebra Help Please?

Algebra Help Please?-example-1

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Area of A: 3x

Area of B: 21

Area of C: x^2

Area of D: 7x

Total area of all four rectangles: x^2 + 10x + 21

I'm not sure what's meant by "sum of the area of the large rectangle", but I believe the point of this exercise is to draw the relationship


(x+3)(x+7)=x^2+3x+7x+21=x^2+10x+21

which is entirely a consequence of the distributive property of multiplication.

User CeccoCQ
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