Question

pls help me find the answer for this question​

Answer 1

Step-by-step explanation:

Given : (r³/8) - (s³/343) - (t³/216) - (1/28) rst

=> (r/2)³ + (-s/7)³ + (-t/6)³ - 3(r/2)(-s/3)(-t/6)

=> [(r/2) + (-s/7) + (-t/6)][(r/2)² + (-s/7)² + (-t/6)² - (r/2)(-s/7) - (-s/7)(-t/6) - (-t/6)(r/2)]

=> (r/2 -s/7 - t/6)[r²/4 + s²/49 + t²/36 + rs/14 - st/42 +  tr/12]

Hope it helps!