Your sum is 4 times 10, or 40. We want to end up with 40. Subtract 8 because you added 8 before to work backwards. You get 32. Divide by 16 because the opposite of multiplication is division. You would get 2.
Answer:
a = 15
b = -10
Step-by-step explanation:
Here, we want to solve the system of linear equations
Firstly, let us multiply the first equation through by 10
2a - 5b = 100 ••••(i)
from the second equation;
a = 29 + b
Substitute this into i
2(29 + b) - 5b = 100
58 + 2b -5b = 100
-3b = 100-58
3b = 42
-b = 42/3
-b = 14
recall;
a - b = 29
a - (-14) = 29
a + 14 = 29
a = 29-14 = 15
So you find out what two numbers add up to 5 and multiply to make -12
so since -12 is negative we know that the two numbers have to be diffarent signs (- times+=-)
also we see that the X^2 term is 2x^2 so we can use the 2
so the factored out form is
(2x+3)(x-4)
because the 2x times -4=-8x
the 3 times the x=3x
add them together and get 3x+(-8x)or 5x which is our middle term
and -4 times 3 =-12 which is our last term
