Select the statement that is true. Answer Choices The sum of 0.12x2+0.3⎯⎯⎯ and 1.5x2-0.75 is 1.62x2+0.416. - 0.45x2+0.9 subtracted from 2.5x2-7.32 is - 2.95x2+8.22. The difference of 18.94x-0.4⎯⎯⎯ and - 10.2x+4.5 is 8.74x-4.94⎯⎯⎯. The product of 0.6⎯⎯⎯x+3.4 and - 6x+5.7 is - 4x2-16.6x+19.38.

Question

Adelyn

Mathematics

13 May, 09:30

Select the statement that is true. Answer Choices The sum of 0.12x2+0.3⎯⎯⎯ and 1.5x2-0.75 is 1.62x2+0.416. - 0.45x2+0.9 subtracted from 2.5x2-7.32 is - 2.95x2+8.22. The difference of 18.94x-0.4⎯⎯⎯ and - 10.2x+4.5 is 8.74x-4.94⎯⎯⎯. The product of 0.6⎯⎯⎯x+3.4 and - 6x+5.7 is - 4x2-16.6x+19.38.

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Timothy Church · Answer 1

The operations given will be evaluated as follows:

1]

(0.12x^2+0.3) + (1.5x^2-0.75)

= (0.12x^2+1.5x^2) + (0.3+0.75)

=1.62x+1.05

2]

(2.5x^2-7.32) - (-0.45x^2+0.9)

(2.5x^2+0.45x^2) + (-7.32-0.9)

2.95x^2-8.22

3] (18.94x-0.4) - (-10.2x+4.5)

= (18.94x+10.2x) + (-0.4-4.5)

=29.14x-4.9

4] (x+3.4) (-6x+5.7)

=x (-6x+5.7) + 3.4 (-6x+5.7)

=-6x^2+5.7x-20.4x+19.38

=-6x^2-14.7x+19.38