simplify 3x (4x-5) + 5 if x= 3 and x=1/2
Answers
Answered by
3
Answer:
66
Step-by-step explanation:
3x(4x−5)+3=12x
2
−15x+3
x=3 gives the value 12(9)−15×3+3
=108−45+3
=66
Answered by
2
Answer:
3x(4x-5)+5
putting x=3,
3(3)[4(3)-5] +5
= 9[12-5]+5
= 9*7+5
= 63+5
= 68
Putting x=1/2
3(1/2)[4(1/2)-5]+5
= 3/2[2-5]+5
= 3/2*(-3) +5
= 9/2 +5
= 19/2
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