Evaluate: 2x² + 3 when x = -5 Type the numeric answer only.

2x²+3

2×(-5)²+3

2×25+3

100+3

103

Step-by-step explanation:

As the value of x is -5, I substituted it and multiplied with 2 as there aren't any signs between so obviously it means to multiply.

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92

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