Question

can anyone solve this

Answer 1

9) substitute x=-3,andy=5 in 2 (x.....
2 ((-4)-30+75-25
-8-30+75-25
-38+50
-22
ok

Answer 2

5.     4(x^2)-3xy+7x+5(x^2)+7xy-5x
     = (4(x^2)+5(x^2))+(-3xy+7xy)+(7x-5x)
     =  9(x^2)+4xy+2x

        (9(x^2)+4xy+2x)-(4xy-7(x^2))
     = 9(x^2)+4xy+2x-4xy+7(x^2)
     = 16(x^2)+0+2x
     = 16(x^2)+2x

6.     (((-2)+5)/3)-1
     = (3/3)-1
     = 1-1
     = 0

7.     (a^2)-(b^2)+4ab
     = (1^2)-(-2^2)+4*1*(-2)
     = 1-4-8
     = -11

8.     5x-2(x^2)+b    =   -3
        -5-2+b            =   -3
         -7+b              =   -3
          b                  =   7-3
                              =   4
9.     2((x^2)+2xy)+5-xy+(y^2)
     = 2(x^2)+4xy+5-xy+(y^2)
     = 2(-3^2)+4*(-3)*5+5-(-3)*5+(5^2)
     = 18-60+5+15+25
    = 3