if f(-3),where f(x)=6+10x-7x^2
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I presume that you want me to find the value of f(-3).
f(x) = 6 + 10x - 7x^2
put x = -3
f(-3) = 6 + 10(-3) - 7(-3)^2
= 6 - 30 - 63
= -87
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1
f(x) = 6 + 10x - 7x^2
The above equation is an identity. Hence, it is true for all values of x.
Thus, put x = -3 in the above identity.
f(-3) = 6 + 10(-3) - 7(-3)^2
= 6 - 30 -7(9)
= 6 - 30 - 63
= 6 - 93
= -87
Thereby, f(-3) = -87.
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