Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

Which inequality has solution ((-\infty,\infty)) in (\mathbb{R})?

Answer and explanation

Correct answer: (7x-4\leq 7x+9)

An inequality has every real number as its solution when simplifying it removes the variable and leaves a statement that is always true. If the remaining statement is always false, there are no solutions. This distinction is useful when the same variable expression appears on both sides.

For option C, subtracting \(7x\) from both sides of \(7x-4\leq7x+9\) gives \(-4\leq9\), which is true for every real number. Hence every real \(x\) satisfies it, so the solution set is \((-\infty,\infty)\). The other options reduce to false statements such as \(-1>2\), \(3<1\), or \(6<-8\).

Related tags

All-Real-NumbersIdentitySolution-Set

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.