Step-by-step explanation:
Ja, es ist passiert, dass mein Lehrer auch dasselbe macht und alle Schüler langweilen
Answer:
(x + y)² = 35
Step-by-step explanation:
The expansion of
(x + y)² = x² + 2xy + y²
= x² + y² + 2xy ← substitute given values
= 25 + 2(5)
= 25 + 10
= 35
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Step-by-step explanation:
115 = 5x + 15
115 - 15 = 5x
100 = 5x
20 = x