Solve quadratic equation by factoring.5(5x2 + 4x) = 21
A. No real solutions
B. - 
, 
C. 3, -7
D. 
, - 
Answer: D
Mathematics
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Translate the problem situation to a system of equations. Do not solve.The difference between two numbers is 16. Three times the smaller number plus the larger number is 48. What are the numbers?
A. x - y = 16; x + 3z = 48 B. x - y = 16; x + 3y = 48 C. x - y = 16; 3x + y = 48 D. x + y = 16; x + 3y = 48
Mathematics
Multiply.-(-9)
A. -1 B. 0 C. -9 D. 9
Mathematics
Add the value that will turn the expression into a perfect square trinomial to complete the square. Then factor the trinomial to a squared binomial.x2 + 3x
A. add 10; (x + 3)2
B. add 
; 
2
C. add 
; 
2
D. add 0; 
2
Mathematics
Use the properties of equality to solve the equation.- 
x = - 
- 
A. 
B. - 
C. - 
D. 
Mathematics