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(−7x^2+3)-(−4x−3)

−7x^2+4x+6

Step-by-step explanation:

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=−7x2+4x+6

Step-by-step explanation: distribute the Negative Sign:

=−7x2+3+−1(−4x−3)

=−7x2+3+−1(−4x)+(−1)(−3)

=−7x2+3+4x+3

Combine Like Terms:

=−7x2+3+4x+3

=(−7x2)+(4x)+(3+3)

=−7x2+4x+6

=−7x2+4x+6

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm