The value of parameter a for which

Magdalena Warren

Magdalena Warren

Answered question

2022-04-11

The value of parameter a for which ax2+3x4a+3x4x2 takes all real values for xR are:
My question is why we need to validate end points i.e. 1,7 (Refer the last part of my attempt)

Answer & Explanation

Varikoseocaz

Varikoseocaz

Beginner2022-04-12Added 9 answers

Step 1
When a=1, y=x2+3x41+3x4x2=x41+4x14 for all xR.
Step 2
When a=7, y=7x2+3x47+3x4x2=7x474x74 for all xR.

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