please please answer mathematics question
Answers
Answer:you can write 2 at the value of x so the x² is 4 andy=4/3 so you can write y² as 16/9 now you put these values at the place of x and y then you got the answer hope it helps you
Step-by-step explanation:
Answer:
1) 64x² + 81y² + 144xy = 784
2) 81x² + 16y² - 72xy = 900
Step-by-step-explanation:
NOTE: Refer to the attachment for alternative method.
1) 64x² + 81y² + 144xy
x = 2
y = 4 / 3
64x² + 81y² + 144xy
It can be written as
( 8x + 9y )²
→ [ 8 × 2 + 9 × ( 4 / 3 ) ]²
→ [ 16 + ( 3 × 4 ) ]²
→ [ 16 + 12 ]²
→ ( 28 )²
→ 28 × 28
→ 784
The value of 64x² + 81y² + 144xy is 784.
2) 81x² + 16y² - 72xy
x = - 2
y = 3
81x² + 16y² - 72xy
It can be written as
( 9x - 4y )²
→ [ 9 × ( - 2 ) - 4 × 3 ]²
→ [ ( - 18 ) - 12 ]²
→ [ - 18 - 12 ]²
→ ( - 30 )²
→ 900
The value of 81x² + 16y² - 72xy is 900.
