1. A cardboard measures (h + y) cm long and (h2 – hy + y2) cm wide. Find its area
A. h3 + 2hy2 + y3 sq. centimeters
B. h3 + hy2 + y3 sq. centimeters
C. h3 + y3 sq. centimeters
D. h2 + y3 sq. centimeters
A. h3 + 2hy2 + y3 sq. centimeters
B. h3 + hy2 + y3 sq. centimeters
C. h3 + y3 sq. centimeters
D. h2 + y3 sq. centimeters
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Answer:
C
Step-by-step explanation:
( h + y ) cm ( h^2 - hy + y^2 ) cm
multiply ( h + y) to ( h^2 - hy + y^2 )
( h^3 - h^2y + hy^2 + h^2y - hy^2 + y^3 )
-h^2y + h^2y = 0
hy^2 - hy^2 = 0
therefore,
the answer will be
( h^3 + y^3 ) cm^2