A square with side length 15 cm is dialated and the image has side length 12 cm. what is the scale factor of the dialation?
1 answer:
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(3 + 
) × (3 - )
Take the special case
(a - b)×(a + b)=a² - b²
a = 3
b =
3² - ()² {(√)² = the number itself}
9 - 5
4
Take the special case
(a - b)×(a + b)=a² - b²
a = 3
b =
3² - (
9 - 5
4
