Question

find value ,while m=3,b=-3

1) 2m+7b
2)2m²-8b
3) -3m+2b-7b²​
4) -10m+7m​

Answer 1

Answer:

1)( 2×3)+(7×-3)

= 6+(-21)

= 6-21

= -15

2)( 2×9)-(8×-3)

= 18-(-24)

18+24

42

3) -3(3)+2(-3)-7×9

-9-6-63

78

4) -10(3)+7(-3)

-30-21

-51

Answer 2

Answer:

1)2m+7b= -15

2)$2m^{2} -8b$=42

3)$-3m+2b-7b^{2}$ = -78

4)-10m+7m=-9

Step-by-step explanation:

It is given that value of m is 3 and value of b is -3

We need to substitute the values of m and b in the given equations

1) 2m+7b=2(3)+7(-3)=6-21=-15

2)$2m^{2} -8b=2(3)^{2} -8(-3)=18+24=42$

3)$-3m+2b-7b^{2} =-3(3)+2(-3)-7(-3)^{2} =-9-6-63=-78$

4)-10m+7m=-3m=-3(3)=-9

We have solved each equation using the given value of m and b

We have kept one thing in mind that if a negative number is sqaured then the result is a positive number and that when a positive number is multiplied to a negative number then the product is negative.