3(7 + 2) = 3x7 + 3x2 is an example of the distributive law.
The distributive law connects multiplication and addition.
3(x+7)
3 times 6.80
it i s eather 1X21 11X11 and
y = -1/(3x7 + 2x - 9)y = -(3x7 + 2x - 9)-1y' = -(-1)(3x7 + 2x - 9)-2(3x7 + 2x - 9)'y' = (3x7 + 2x - 9)-2(21x6 + 2)y' = (21x6 + 2)/(3x7 + 2x - 9)2
3*7 = 21
3x7 = 21
22
3 x 7 = 3 x (5 + 2) And since multiplication is distributive over addition, 3 x (5 + 2) = 3 x 5 + 3 x 2
We don't know and can't calculate it, until we're given the value of 'x'.
133
41
2x7 = 14 x7 = 7 3x7 = 3*7 = 21
3 times 6.80
it i s eather 1X21 11X11 and
y = -1/(3x7 + 2x - 9)y = -(3x7 + 2x - 9)-1y' = -(-1)(3x7 + 2x - 9)-2(3x7 + 2x - 9)'y' = (3x7 + 2x - 9)-2(21x6 + 2)y' = (21x6 + 2)/(3x7 + 2x - 9)2
It is: 5+(3*7) = 26
3*7 = 21
-50, first you do 3x7=21x(-2)=-42 then 8-(-42)=-50