Question

find the value of the polynomial 4x2 -3x+7 at x=-1 9th class maths.please tell me the correct answer fastly please. don't cheat me. please understand my Ssituation ​

Answer 1

Answer:

8

Step-by-step explanation:

All you have to do is substitute the given value in the equation itself.

here, 4x²-3x+7, becomes 4(1)²-3(1)+7

4-3+7=1+7=8.

Hope it helps!

Answer 2

Answer:

$p(x) = 4 {x}^{2} - 3x + 7 \\ \bold{to \: prove \colon} \: p(x) = 0 \: \: \: if \: x = - 1 \\ 4 ({ - 1})^{2} - 3( - 1) + 7 \\ 4 + 3 + 7 = 14 \\ 14 \not =0 \\ \therefore \:p(x) = - 1 \: is \: not \: equal \: to \: zero \: and \: is \: not \: a \: factor \: of \: p(x).$

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