Answer:
Step-by-step explanation:
1)
(x*1) * (x-1) + 2[tex]x^{2}[/tex] = [tex]x^{2} - 1^{2} + 2x^{2}[/tex] = [tex]3x^{2} - 1[/tex]
2)
(x+2) * (x-1) - 2 * (x+1) = [tex]x^{2} - x + 2x - 2 - (2x + 2) = x^{2} + x - 2 - 2x - 2 = x^{2} - x - 4[/tex]
3)
[tex]\frac{x + 45}{9} = 8\\\\x + 45 = 9 * 8= 72\\x = 72 - 45 = 27[/tex]
