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Mathematics 9 Online
jacobrios15:

Select the quadratic expression that represents the product below. a--8x2 - 6x + 35 b--8x2 + 6x - 35 c--8x2 - 34x + 35 d--8x2 + 34x - 35

dude:

Where is the given equation?

jacobrios15:

it is (2x+5)(7-4x)

Angle:

OK bare with me, answer a few easy question I throw your way and we can get to your answer easily first (2x)*(7) so what is 2 times 7?

jacobrios15:

14

Angle:

awesome next (2x)*(4x) so what is 2 times 4?

jacobrios15:

8

Angle:

amazing! next is the middle ones (5)*(7) so what is 5 times 7?

jacobrios15:

35

Angle:

perfect! and finally the last two numbers (5)*(-4x) so what is 5 times Negative 4?

jacobrios15:

i think -20

Angle:

wonderful! that's right :) so, (14)x - (8)x^2 + 35 - (20)x can be reorganized and simplified to: -8x^2 - 6x + 35

jacobrios15:

thank you:)

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