Question

(5x2 - 4x + 3) + (2x + 7-9
$(5 - 4x + 3) + (2 { }^{2} +7×-9$
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Answer 1

(5x2 - 4x + 3) + ( 2x + 7 - 9 )

( 5 - 4x + 3 ) + ( 2² + 7x - 9 )

5 - 4x + 3 + 2² + 7x - 9

5 - 4x + 3 + 4 + 7x - 9

- 4x + 7x = - 5 - 3 - 4 + 9

3x = - 12 + 9

3x = - 3

x = - 3 / 3

x = - 1