Answer:
C
Step-by-step explanation:
Answer:
(x + y)² = 25
Step-by-step explanation:
The expansion of (x + y)² is
(x + y)² = x² + y² + 2xy ← substitute x² + y² = 15 and xy = 5
= 15 + 2(5)
= 15 + 10
= 25
Answer:
(1, 3), (2, 4).
Step-by-step explanation:
y= x² - 4x + 6
y = x + 2
Substitute for y in the first equation:
x + 2 = x²- 4x + 6
x^2 - 5x + 4 = 0
(x - 1)(x - 4) = 0
x = 1, 4
When x = 1 , y = 1 + 2 = 3.
When x = 4, y = 4 + 2 = 6.
Answer:
x=4
Step-by-step explanation:
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