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3 years ago

Calcule as seguintes multiplicações:

Mathematics

1 answer:

dezoksy [38]3 years ago

4 0

Answer:

A. 26i

B. 36i^2 + 60x + 25

C. 64x^2 + 112x + 49

Step-by-step explanation:

To get answer in question A, B, and C, use FOIL method

FOIL Method:

$(a + b)(c + d) = ac + ad + bc + bd$

(pretend x is i)

Question A:

$(6 + 4x)(2 + 3x) \\ 12 + 18x + 8x - 12 \\ 26x$

Question B:

$(5 + 6x)(5 + 6x) \\ {(5 + 6x)}^{2} = {36x}^{2} + 60x + 25$

Question C

$(7 + 8x)(7 + 8x) \\ {64x}^{2} + 112x + 49$

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The triangle for the given scenario is drawn below.

From the triangle ΔABC, AB is the length of the ladder, B is the foot of the ladder, AC is the wall, BC is the distance of the foot from the wall, and angle B is the angle of elevation of the ladder with ground.

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