Question

(a-2) ( a+2) -3a = (a-3) (a+3)
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Answer 1

a=5/3

Step-by-step explanation:

Steps

(a - 2)(a + 2) - 3a = (a - 3)(a + 3)

Expand (a-2)(a +2): a²-4

a ^ 2 - 4 - 3a = (a - 3)(a + 3)

Expand (a-3) (a+3): a²_9

a ^ 2 - 4 - 3a = a ^ 2 - 9

Add 4 to both sides

a ^ 2 - 4 - 3a + 4 = a ^ 2 - 9 + 4

Simplify

a ^ 2 - 3a = a ^ 2 - 5

Subtract a² from both sides a ^ 2 - 3a - a ^ 2 = a ^ 2 - 5 - a ^ 2

Simplify

- 3a = - 5

Divide both sides by -3

(- 3a)/- 3 = - 5/- 3

Simplify

a = 5/3

Answer 2

Answer:

LHS

(a²-4)-3a

-3a³+12a

RHS

a²-9

putting LHS =RHS

-3a³+12a=a²-9

‐3a³-a²+12a-9=0

after simplify a=5/3

Step-by-step explanation:

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