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Simplify (–x2 +5) – (3 – 4x2)

Sagot :

when you subtract you have to change the signs so it would be -3+4x2
then you combine like terms to get 3x2+2 i am assuming the 2"s mean squared

bookgirl9632
[tex] (-x^{2} +5)-(3-4 x^{2} )[/tex]
To simplify this, use the FOIL method. First, Outer, Inner, Last.
First: Multiply the first numbers in each set of parentheses.
[tex]-x^{2} *-3=3 x^{2}[/tex]
Outer: Multiply the two outermost numbers in the equation.
[tex]-x^{2} *-4 x^{2} =5 x^{4}[/tex]
Inner: Multiply the two innermost numbers in the equation.
[tex]5*-3=-15[/tex]
Last: Multiply the last numbers in each set of parentheses.
[tex]5*-4 x^{2} =-20 x^{2} [/tex]
Then, we put them all together in an equation, from the highest exponent to the lowest, then highest prefix (number before the variable) to lowest.
[tex]5 x^{4} -20 x^{2} +3 x^{2} -15[/tex]
And simplify.
[tex]5 x^{4} -17 x^{2} -15[/tex]
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