Question

(a-2)²-3a=(a-3) ²
please help me ​

Answer 1

Answer:

(a-2)²-3a=(a-3)²

a²+4-4a-3a=a²+9-6a

a=-5

Answer 2

Answer:

$( {a - 2})^{2} - 3a = (a - 3) ^{2} \\ \\ = > {a}^{2} - 2 \times a \times 2 + {2}^{2} - 3a = (a - 3) ^{2} \\ \\ = > {a}^{2} - 4a + 4 - 3a = (a - 3) ^{2} \\ \\ = > {a}^{2} - 7a + 4 = {a}^{2} - 2 \times a \times 3 + {3}^{2} \\ \\ = > {a}^{2} - 7a + 4 = {a}^{2} - 6a + 9 \\ \\ = > {a}^{2} - {a}^{2} - 7a + 6a + 4 - 9 = 0 \\ \\ = > - a - 5 = 0 \\ \\ = > - (a + 5) = 0 \\ \\ = > a + 5 = 0 \\ \\ = > a = - 5 \\ \\ formula \: used \\ \\ (a - b) ^{2} = {a}^{2} - 2ab + {b}^{2}$

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