Part A: Multiply (5x2 + x − 4)(x + 2). Part B: Multiply −3x2(6x2 + 2x − 3). Part C: Let f(x) = x2 + 3x − 4 and g(x) = x + 5. Find f(x) ⋅ g(x). Part D:  Which of the following represents the area of a rectangle whose length is 5x − 3 and whose width is x + 7?  5x2 − 21  5x2 + 9x − 21  5x2 + 32x − 21  5x2 − 32x − 21

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A: topic- linear equation in one variable

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A: We can find the dimension of the rectangle as below.

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A: By using algebraic properties

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A: Given : 3+2(x+1)=6x

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A: Topic - Simplification

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