Question

7. Find the value of x.
a) 5x = (45)2 - (40)2
b) 7x = (35)2 - (21)2
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Answer 1

Step-by-step explanation:

a) 5x = (45)2 - (40)2

5x=90-800

5x=10

x=2

b)b) 7x = (35)2 - (21)2

7x=70-42

7x=28

x=4

Answer 2

Answer:

5x=(45)2 - (40)2. ( (45)2=90,(40)2=80)

5x=90-80.

5x=10.

x=5/10. (5*2=10)

x=2

hope it helps☝