Question

3a^2 + 4a -5) + (2a^2 +3a +7 ) is ____________
(1 Point)

a) 5a^2 +7a +2

b) 5a^2 +7a -2

c) a^2 +7a +2

d) a^2 +3a -2


2 questions


If 9x/8 + 1 = 10 ,then the value of x is __________
(1 Point)

a) 8

b) 10

c) 4

d) 15​

Answer 1

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$\large{(3a^2 + 4a -5) + (2a^2 +3a +7 ) }\\ \\ \large{3a^2 + 4a -5 +2a^2 +3a +7} \\ \\ \large{(3a^2 + 2a^2) + (4a + 3a) + ( - 5 + 7)} \\ \\ \large{5a {}^{2} + 7a + 2 }\\ \\ \large{\therefore \: option \: (a)}$

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$\large{\frac{9x}{8} + 1 = 10} \\ \\ \large{ \frac{9x}{8} = 10 - 1 } \\ \\ \large{ \frac{9x}{8} = 9} \\ \\ \large{9x = 9 \times 8} \\ \\ \large{9x = 72} \\ \\ \large{x = \frac{72}{9} } \\ \\ \large{x = 8} \\ \\ \large{\therefore \: \: option \:(a) }$