Simplify 5y (4y – 5) + 3 and find its value for (i) y = 3 (ii) y = −1/2
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Answers
Answered by
3
Step-by-step explanation:
1 ) y= 3
5y (4y – 5) + 3
5×3 ( 4× 3 - 5) + 3
15 ( 12 -5) + 3
15 ( 7) + 3
105 + 3
108 answer
2) y= -1/2
5y (4y – 5) + 3
-1/2 × 5 ( 4 × -1/2 - 5) +3
-5/2 ( - 2 - 5) + 3
-5/3 ( -7) + 3
35/5 + 3
50/ 5
10
Answered by
1
Answer:
(i) 108 (ii) 10.5
Step-by-step explanation:
5y(4y-5)+3
=20y² - 25y + 3
(i) y=3
=20×3² -25×3+3
=180-75+3
=108
(ii)y=-1/2
=20×(-1/2)²-25×(-1/2)+3
= -20/4 +25/2+3
=-5+12.5+3
=10.5
hope it helps....
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