Substitution in a Formula

Probability Level 1

Given that y = 2x3 – 4x2 + 3x – 5, find the value of y when x = -2, -1, +1, +2.

-2, -1, +1, and +2 are -43, +1, -3 and -0 respectively -2, -1, +1, and +2 are +43, -7, +0, and +2 respectively -2, -1, +1, and +2 are -43, -14, -4, and +1 respectively -2, -1, +1, and +2 are -44, -14, -0 and +4 respectively

Jasveen Sandral by Jasveen Sandral , 20, India

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

2 solutions

Mardokay Mosazghi
Mar 30, 2014

Substitute the given and solve , when you prove one or more you are definite that the answer is -2, -1, +1, and +2 are -43, -14, -4, and +1 respectively.

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Daniel Liu
Mar 30, 2014

Note that plugging in x = 1 x=1 gives the sum of the coefficients. The sum of the coefficients, with some simple arithmetic, is 2 − 4 + 3 − 5 = − 4 2-4+3-5=-4 , and then pick the only option with a − 4 -4 on the third number: -2, -1, +1, and +2 are -43, -14, -4, and +1 respectively. \boxed{\text{-2, -1, +1, and +2 are -43, -14, -4, and +1 respectively.}}

0 Helpful 0 Interesting 0 Brilliant 0 Confused

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...