Factor the following quadratic expressions.
1. x2 + 9x + 20
2. 3x2 + 27x + 60
3. 4x2 + 9x + 5
4. 3x2 − 2x − 5
5. −2x2 + 5x
6. −2x2 + 5x − 2
7. 5x2 + 19x − 4
8. 4x2 − 9
9. 4x2 − 12x + 9 [this one is tricky, but look for a special pattern.]
10. 3x2 − 13x + 12

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

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ok

step-by-step explanation:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!