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heavenwagner
27.08.2019 •
Mathematics
4pq(3-q)+2p(q-3)-7q(p-2pq)-2p(5q^2 +3)
the final result contains how many terms?
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Ответ:
12pq - 4pq² + 2pq - 6p - 7pq + 14pq² - 10pq² - 6p
12pq + 2pq - 7pq - 4pq² + 14pq² - 10pq² - 6p - 6p
7pq - 12p
Ответ:
x=5.6
y=-5.6
Step-by-step explanation:
3x - 5y = 14 Equation 1
– 2x + 2y = 0 Equation 2
Simultaneous equation can be solved either through elimination method or substitution method. But we use elimination method for this question
Multiply equation 1 by -2 (the coefficient of x in equation 2) and multiply equation 2 with 3 (the coefficient of x in equation 1), so that x will have the same coefficient in the new equations, and easy to eliminate
-2(3x - 5y = 14)
-6x+10y=-28 Equation 3
3(– 2x + 2y = 0)
-6x+6y=0 Equation 4
Subtract equation 4 from 3 to eliminate x
-6x+10y=-28
-6x+6y=0
-6x-(-6x)=-6x+6x=0
10y-6y=5y
-28-0=-28
5y=-28
y=-28/5
y=-5.6
Substitute for y in equation 2
– 2x + 2y = 0
– 2x + 2(-5.6) = 0
-2x-11.2=0
-2x=11.2
x=-11.2/2
x=5.6